Transmigrating into the Ex-Sister-in-Law of a Period Novel

[Completed] In her previous life, Lin Muxin had nothing but money. After she died, she transmigrated into a novel. She thought she had finally gained a family, only to discover that the cannon-fodder husband of the novel's heroine was her older brother, while she herself was the heroine's frail, sickly former sister-in-law. On the third day after her brother's funeral, the heroine, now her sister-in-law, abandoned her young nephew and ran off to the richest and most powerful male lead in the book to start a new romance. Looking at her innocent little nephew chewing on his fingers, her parents broken with grief, and a rice jar that even the mice wouldn't bother with, Lin Muxin could only silently open the exchange System that had come with her transmigration into the book. Unexpectedly, a year later, her